Grate-bar



(Nq Mode-1;)

'0. W. vWITHENBURY.-

" N. 2136.,.924.y Patented Jan. 25,1881.

' nven or' PATENT OFFICE.

CHARLES W. WITHENBURY, OF CINCINNATI, OHIO.

GRATE-BAR.

SPECIFICATION forming part of Letters Patent No. 236,924, dated January 25, 1881.

Application filed December 3, 1880.

1o singly in short lengths, and has for its object the construction of a bar which, while it shall possess the maximum of strength, shall be of the lightest form and shall oer the least resistance to the passage of air to the fuelburn- I5 ing thereon.

My invention consists in forming the bar as an open arch,the upper portion of which shall be straight and iat to receive the fuel, and ot' a thickness equal to or less than the air-space zo between adjacent bars, and the lower portion of which shall be of an inverted-arch yform,the ends curving up to projections which rest upon the bearing-bars to support the gra-tes. The lower portion of the bar is gradually tapered z 5 or thinned toward the bottom to offer the least possible obstruction to the passage of air hetween adjacent bars. A

In the accompanying drawings, Figure 1 represents, in elevation, my improved gratebar, and Fig. 2 is avertical section ou the line Similar letters of reference indicate similar parts.

Ais the grate-bar, provided with projections (No model.)

a a, which rest upon bearers B B. The bearers rest upon the side walls of the furnace, and pass transversely under the grate-hars in the usual manner. A is the arched opening, with llets at a a. The arched opening, through the web of the bar removes the metal from the center and transfers it to the ends A2 A2, whereby, for a given weight of iron employed, the bar is made much stronger than it would ordinarily be when constructed of the usual form.

I am aware that perforated grate-bars ar not new, and that a grate-bar having elongated and also triangular openings on opposite sides of a central sustaining-post is not new, and such constructions are hereby disclaimed.

Havingdescribed myinvention, what I claim Is- 'Ihe grate-bar herein described, formed with the downward-tapering web A2, extending the length of said bar and terminating in end supports, a, said tapering web being formed atits center with the single arched opening A', the base portion ofthe arched opening being formed in a straight plane, all constructed as shown, and for the purpose set forth.

In testimouywhereof I have signed my name to the foregoing specification in the presence of two subscribing witnesses.

CHARLES W. WITHENBURY.'

Witnesses:

EDGAR J. GRoss, COLLIN FORD, J r. 

